chore: remove committed QA screenshots and debug history file (#1053)

These 12 QA screenshots and a local debug query log were accidentally
committed to the repo root in PR #978. Adds .gitignore entries for
screenshot-*.png and history.txt to prevent recurrence.

Author: lfnovo

.gitignore

@@ -147,3 +147,7 @@ specs/
 # Use it for host-specific tweaks like re-exposing the SurrealDB port;
 # see docker-compose.override.yml.example.
 docker-compose.override.yml
+
+# Local QA/debug artifacts
+screenshot-*.png
+history.txt